Oh,
Chipotle. The restaurant has been caught with its hands in the salsa container
when an amateur sleuth noticed that it's been rounding its bills to eliminate
pennies:

On several recent shopping trips, Jayson Greenberg wondered what the
deal was with pennies — or the lack thereof — at Chipotle
Mexican Grill in West Caldwell.

"The receipts at the Chipotle in West Caldwell don’t add
up when there are odd amounts involved," he said. [...]

On the first, dated July 13, the nine items added up to $32.93. There
was $2.31 in tax. The total should have been $35.24, but next to the
"total" line on the receipt, it said $35.25.
The next receipt, with the same sale date, showed a subtotal of $8.64.
The tax was $0.60, so the grand total should have been $9.24. But no.
With Chipotle-style math, the total was $9.25.

The third receipt, dated July 17, had a subtotal of $17.75 and tax
of $1.24. The total? $19.00, but elementary school students would have
come up with $18.99.

To complicate matters further, pricing policy actually varies from States to States, here in the USA. Some states do not include the sales tax, whereas others do. I agree with you that pennies are an inconvenience, but my wife loves getting change.